four-step

The compound adjective 'four-step' is a transparent modern English formation, combining the cardinal number 'four' with the noun 'step'. The root for 'four' can be traced back to the Proto-Indo-European (PIE) root kʷetwóres, which evolved into the Proto-Germanic fedwōr and subsequently into Old English fēower. The word 'step' originates from the PIE root stebh- (meaning 'post, stem, to support'), which led to the Proto-Germanic stap- and the Old English stæppan, meaning 'to tread'. The logic of the compound is entirely literal, directly describing a process divided into four distinct stages or movements, reflecting a straightforward method of creating descriptive technical or procedural terminology in English.

Structure: four (number) + step (stage) - four: From Old English fēower, of Proto-Germanic origin; related to Latin quattuor and Greek tessares. Functions as a numerical determiner. - step: From Old English stæpe, stepe (noun), stæppan (verb), of Germanic origin; related to Dutch stap and German Stapfe. Functions as a noun denoting a stage or action.